Questions tagged [connections]
One or more connections to a database or database server. For questions about *establishing* a connection, use the **connectivity** tag instead.
210
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How can I create a brand new alarm based on a verification not listed by default on SQL Server?
I want to create an alert like the ones from Brent Ozar's How to Configure SQL Server Agent Alerts, but I couldn't find a message related to the error I want to monitor on sys.messages as the ...
- 4,394
4
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1
answer
51
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SET SINGLE_USER WITH ROLLBACK IMMEDIATE only disconnects sessions when account is a database user
The following code creates a user that is able to restore a database:
CREATE LOGIN RestoreUser WITH PASSWORD = 'MyPassword'
ALTER SERVER ROLE dbcreator ADD MEMBER RestoreUser
This works fine and the ...
- 1,450
3
votes
3
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216
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Can connect to virtual MySql instance using 127.0.0.1, but not localhost
Running MySql 5.7.33 on a local VirtualBox instance. I have forwarded port 3306 from the virtual server to be accessible locally. On my virtual host, I have this in my /etc/mysql/my.cnf file ...
[...
- 575
-3
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2
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222
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Change max_connections Postgresql
how i can change max_connections on Postgresql.conf without restart service Postgresql?
Systemctl reload postgresql.service not work with this conf.
- 7
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112
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Unable to connect to Mongodb database using the Mongodb compass
I have created a mongoDB database on DigitalOcean, then I try to establish a connection to the database using MongoDB Compass. However, when I try to do so, "connect ECONNREFUSED 143.198.217.148:...
- 1
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35
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Datagrip connecting to databases on launch
I'm using Jetbrains Datagrip to connect to Mysql servers. My problem is that Datagrip connects to the various databases I created as soon as I launch it. That's not a problem with development ...
- 101
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1
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322
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PostgreSQL 12 dropped replication slot but standby is still trying to contact the primary
We have recently decommissioned a standby that was experiencing some hardware issues from our streaming replication cluster. We were able to successfully stop the PID on the primary and then drop the ...
- 111
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544
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Azure Data studio - connection to server in the same network - Error: The received certificate has expired
I am trying to connect to SQL server on my network with Azure Data Studio, and I am getting error:
A connection was successfully established with the server, but then an error occurred during the ...
0
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1
answer
123
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How to forcefully drop all active connections off a database?
On one server I have a Postgresql database and there're many clients on other servers accross the internet that connect to it. I want to drop all the active connections on demand, they should be ...
- 1
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665
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PostgreSQL: Using the .pgpass file
I have been reading up on the .pgpass file, but I can’t get it working for me.
My .pgpass file looks something like this:
127.0.0.1:5432:accounts:fred:p@55w0rd
I set the privilege to 0600 (this is on ...
- 2,337
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67
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postgres pg_basebackup terminating connection
I am unable to successfully use pg_basebackup with my database.
system details:
virtual Ubuntu server 20.04
4 cores
32GB memory
storing postgres data to a virtual drive mount (3.5TB capacity)
postgres ...
- 11
0
votes
2
answers
3k
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Test connection failed because of an error in initializing provider. DBNETLIB ConnectionOpen SecDoClientHandshake SSL security error
I'm running all Windows 2016 Servers. I've got MS SQL 2016 installed on one. For whatever reason, we cannot connect to the SQL Server unless we enable TLS 1.0 which is obviously not cool.
I found ...
- 11
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1
answer
185
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When a thread/process crashes on acquired DB locks, how does DB detects that and releases the lock?
Take MySQL as an example, say a thread run SELECT ... FOR UPDATE crashes before committing the update, how does MySQL detect the crash and release the lock?
I assume most RMDBS will have some keep-...
- 101
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28
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postgresql, connection limit for different roles
Is possible setup in postgresql.conf connection limit for specified role globally (in some .conf file) or individually?
For example, I have 3 roles and max_connections = 600.
Need to setup max 10 ...
- 153
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1
answer
155
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ODBC Calling Fill - Unexpected closed connection after 2 hours
Using PostgreSQL 12.3 (Ubuntu 12.3-1.pgdg18.04+1) on x86_64-pc-linux-gnu, compiled by gcc (Ubuntu 7.5.0-3ubuntu1~18.04) 7.5.0, 64-bit
I use driver PostgresSQL Unicode(x64) version 13.00.00.00
I have ...
- 3
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1
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687
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many "unauthenticated user" on MySQL Processlist
In show processlist I have (from time to time) lot of unauthenticated user.
How it looks like?
| 187743 | unauthenticated user | connecting host | NULL | Connect | 39173 | ...
- 1
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1
answer
52
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Identifying processes that open MySQL connections
I need to identify which application process issues a large number of MySQL connections on a Linux system.
The show processlist sql command or tools like innotop do not really help, as they only show ...
- 111
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2
answers
59
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Nested Stored Procedure Connections
I have a Stored procedure that simply looks for Imported files through a set of other processes. The main SP runs every 5 mins and looks for new files in a directory and imports them into a staging ...
- 53
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1
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250
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Why is MySQL not connecting when reading from mylogin.cnf?
On Ubuntu 20.04, I can log into a server by specifying the log credentials on the CLI:
$ mysql -h172.30.0.2 -uroot -p bar -e "SELECT id FROM users LIMIT 1;"
Enter password:
+----+
| id |
+---...
- 1,048
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1
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84
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MultiSubnetFailover=true for DBMSes besides SQL Server
A connection string for SQL Server can contain MultiSubnetFailover=true, to handle multiple DNS A records, letting the client try to connect to every IP address of a domain (or subdomain) name, to ...
- 179
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1
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43
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Unknown source of high number of connections
In MySQL/Aurora I see from time to time a spike in connections number (from about 100 to 4000):
MySQL doc says:
Connections
The number of connection attempts (successful or not) to the MySQL server.
...
- 373
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1
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30
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SQL Server Identifying Connections that are utilising SQL from an application
Is it possible to identify connections in SQL Server 2014 that are utilising SQL that is passed from an application as opposed to calling an SP ?
- 1,415
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408
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Warning message: invalid value for parameter "default_tablespace" in postgres
I create a new tablespace using the following script:
CREATE SCHEMA semiarido;
CREATE ROLE semiarido PASSWORD 'senha';
GRANT CREATE ON SCHEMA semiarido TO semiarido;
GRANT USAGE ON SCHEMA semiarido ...
- 101
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0
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139
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2020-07-29T07:44:29.817503Z 108716 [Note] Aborted connection 108716 to db:
We are getting continuously logs in mysql error logs
2020-07-29T07:46:56.534666Z 111536 [Note] Aborted connection 111536 to db: '' user: '' host: '' (Got an error reading communication packets)
we ...
- 23
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2
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67
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How Are SQL Server Clients Connecting?
I am asking two questions in this post. If I see activity in netstat with port 1433 for an unnamed instance, whose tcp addresses are not enabled, what does that mean?
What is the preferred way to ...
- 125
1
vote
2
answers
484
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Why would I download CA certificate when starting a managed Postgres cluster on DigitalOcean?
I am trying for the first time a Postgres cluster provided as a managed service by DigitalOcean.com.
As part of configuring the new cluster, their web interface gives me a user name, password, port ...
- 8,986
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25
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Why do I have 2 connections when im using 1 client?
The command:
select * from pg_stat_activity
shows all currently active connections.
The database is hosted by AWS RDS and I am accessing the database with pgAdmin 4, thus I expect one other ...
- 61
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395
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Postgres memory usage grows over time, resets when clients restarted
I have a Postgres DB running on the same small server as some applications that use it. Immediately after restarting the applications, Postgres uses <100 MB memory. After a few days without ...
- 101
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1
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41
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Why would the user matter for performance when running a query?
I have a web page with a database lookup that contains multiple optional parameters.
When I select a couple of parameters and run the query, it returns in less than two seconds.
However, when another ...
- 137
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6k
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How to see unclosed PostgreSQL connection while using psycopg2? [closed]
I run python code:
con = psycopg2.connect(some_dsn)
cur = con.cursor()
cur.execute(some_sql)
res = cur.fetchone()
#con.close() <-- connection is not closed
Then I try:
ps auxf | grep postgres
...
- 121
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562
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SQL Server Encrypted Connections - Configuration Manager does not see Certificate
My goal is to implement encrypted connections on Test SQL Server instance
First, tried to create self-signed certificate in the Certificates snap in (certlm.msc), Personal > All Tasks > Request New ...
- 4,408
1
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2
answers
2k
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Queries on large database kill connection to the server, works with LIMIT
I'm trying to run queries on a large-ish database without killing the connection to the server.
I'm using Postgres 12.1 on a mac with 16gb of memory, and about 40gb of free disk. The database is ...
- 21
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1
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896
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How many pool connection size should be set for a 1000 users Jira system?
For a Jira system, if use Jira's default connection configuration as below:
<?xml version="1.0" encoding="UTF-8"?>
<jira-database-config>
<name>defaultDS</name>
<...
- 149
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votes
1
answer
72
views
SQL*Loader and DC firewall timeout
We are loading a huge dataset using SQLLDR and there are index creation that lasts for a couple hours or even more. Firewall drops this connection as there is no data transfer during index creation ...
- 371
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votes
1
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48
views
Remote connection scheme without Windows Authentication/Domain in detail [closed]
There is a legacy C++ system that needs to be "translated", that uses ODBC for connecting to remote SQL Server Database.
System is distributed to many different OS and different domains, some always ...
- 13
1
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1
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99
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Audit logins and logouts [duplicate]
I need to trace and monitor client login connections (successful and failure) to our important SQL servers (20 MSSQL Server). What method do you recommend?
Note: I think enabling "both failed and ...
- 111
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1
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1k
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Same session ID(with same SQL text) but 3 different connection ids
I was listing out all sessions open in my sql server 2016 production server.
I have issues with slow performance and i have been investigating it.
I see that i have several same sessions(session_id) ...
- 1,285
1
vote
2
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1k
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SSMS How do I open a new Query Window using Same Connection Instance of current Window
Coming from Oracle I have discovered that SSMS connects slightly different than Oracle's SQL Developer. Oracle you click ONE connection and then all tabs you open then use that Connection. SSMS ...
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2
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5k
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How to connect using PDB userid on Oracle 18c XE?
I have created a PDB on Oracle 18c XE using following SQL command
create pluggable database virlux
admin user test1admin identified by test1pwd
file_name_convert = ('/pdbseed/', '/test1/')
;
Now, I ...
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1
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227
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Record MultiSubnetFailover value at connection?
With AlwaysOn, there are 3 options for the keyword MultiSubnetFailover
True (yes)
False (no) (example)
Not sent/used
Not all applications support it's use in connection strings. Not all vendor ...
- 5,998
1
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2
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1k
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MySQL 5.6 -- How do I tell if I need to increase innodb io thread setting?
I am trying to tune my mysql server for the high end system. We are using 16--32 core hosts with memory > 100GB.
I have looked into a bunch of existing setting, but not sure if I need to tune up the ...
- 143
2
votes
1
answer
525
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User connections without a login
I was looking at SQL Server performance and noticed that CPU utilization goes high when the number of connections go high(I believe it is normal).Usually number of connections on an average was ...
- 1,285
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1
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146
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ODBC connection with RD Gateway [closed]
here at my company, we use an RD Gateway server.
that means when we want to access a server we have to set up the gateway in the connection...something like rdsgw.mycompany.com
But, how could I do an ...
- 101
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1
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26
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how to change the driver of a ole_dbconnection from oracle_32bit to oracle_64bit
i have the connection string of:
connection= new OleDbConnection("Provider=OraOLEDB.Oracle;UserId=userid;Password=password;
Data Source=database;OLEDB.NET=true");
However after Oracle_64bit driver ...
- 47
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918
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Aborted connections (Erros reading communication packets)
I set up a new Database Server over a SQL Dump with innoDB MYSQL 5.7 from MYSQL 5.6. The Server running external with many sleeping SMTP connections over 1 Mio a day. I made the server open for ...
- 11
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69
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Is It Okay to Leave the Connection Open and Set CommandTimeout for Long Durations?
I have to process daily files and it's a long process that deletes, imports and updates processes. Like literally 20 to 30 minutes per file for several files a day.
** EDIT: I also have some ...
- 195
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259
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Is sp_getapplock recommended for long running locks (> 10 minutes)?
I'm trying to get rid of a Redis dependency in our application.
We notice that is worse for our uptime to have a dependency on both SQL and Redis, above the performance benefits Redis would give us.
...
- 333
2
votes
2
answers
244
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MSSQL over the internet but we connect over RDP
We connect throguh RDP to our ERP solution which uses MSSQL 2008, right now I can see on windows logs and SQL logs that we have a HUGE amount of connection attempts to sa user and results in slow ...
- 21
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53
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What is a connection in MySQL Workbench?
I've searched so much and still found no answer to what exactly a connection is. I'm a beginner and don't know how connecting to databases/servers works, so I can't move forward yet.
What does the ...
- 11
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1
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27
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Way to check where the MySQL connection was initialized?
Is there a way to identify who created the MySQL connection?
For example:
in file a.php
$conn = mysqli_connect($dbhost, $dbuser, $dbpwd, null, $port, $socket);
I would like to know that this ...
